2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 6: Coatings, Cement, Rare Earth & Ferro-alloys
| Editors: | Kongoli F, Yildirim H, Hainer S, Hofmann K, Proske T, Graubner C.A., Albert B |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 200 pages |
| ISBN: | 978-1-987820-29-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Fluorescence Study of The Film formation From PS Latex- TiO2 Composites: Effects of TiO2 Content, Film Thickness and Particle Size
Saziye Ugur1; Onder Pekcan2; Selin Sunay3;1ISTANBUL TECHNICAL UNIVERSITY, Istanbul, Turkey; 2KADIR HAS UNIVERSITY, Istanbul, Turkey; 3PIRI REIS UNIVERSITY, Istanbul, Turkey;
Type of Paper: Regular
Id Paper: 403
Topic: 19
Abstract:
Steady-state fluorescence (SSF) technique in conjunction with UV-visible (UVV) technique, atomic force microscope (AFM) and scanning electron microscope (SEM) was used for studying film formation from TiO2 covered polystyrene (PS) latex particles. The effects of TiO2 content, film thickness and PS particle size on the film formation and structure properties of PS/TiO2 composites were studied. For this purpose, in the first part, two different sets of PS films with thicknesses of 5 and 20 μm were prepared from pyrene-(P-) labeled PS particles (320 nm) and covered with various layers of TiO2 using dip-coating method. These films were then annealed at elevated temperatures above glass transition temperature (Tg) of PS in the range of 100–280 0C. Fluorescence emission intensity, Ip from P and transmitted light intensity, Itr were measured after each annealing step to monitor the stages of film formation. The results showed that film formation from PS latexes occurs on the top surface of PS/TiO2 composites and thus developed independent of TiO2 content for both film sets. But the surface morphology of the films was found to vary with both TiO2 content and film thickness. After removal of PS, thin films provide a quite ordered porous structure while thick films showed nonporous structure. In the second Part, two film series were prepared from PS particles with diameters of 203 nm (SmPS) and 382 nm (LgPS) by covering them with different layers of TiO2 and annealed them at elevated temperatures. Results showed that SmPS/TiO2 films undergo complete film formation independent of TiO2 content. However, no film formation occurs above a certain TiO2 content in LgPS/TiO2 films. SEM images showed that SmPS/TiO2 films have highly well-ordered microporous structures with increasing TiO2 content after extraction of PS polymer whereas LgPS/TiO2 composites show no porous structure for high TiO2 content. Our experiments also showed that porous TiO2 films with different sizes could be successfully prepared using this technique.
Keywords:
Coatings; Heat; Industry; Surface; Titanium;References:
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